storage location from Shopping Cart is overwritten in PO

Hi

I am trying to convert a Shopping Cart to Purchase order using the sourcing application. However while doing that my Shopping Cart Storage location always gets overwritten by one particular Storage Location in PO. Even if i try and change the storage location to the correct one in PO, it again gets overwritten. This is causing problem during the Goods Receipt.

I am using the SRM 5.0 version and recently the system got upgraded to Support Pack 9.

Any help in this regard would be highly appreciated.

regards

manoj